摘要
南海中尺度涡旋形成机制复杂,影响因素众多,数值模拟、定量统计等方法在分析涡旋时空关系上尚存在一定局限性。采用了粗糙集理论,在不添加任何先验信息的基础上,进行南海中尺度涡旋时空关系的表达,并以2003年11月至2009年6月遥感反演图像中提取的涡旋数据为例,分别以海区、产生时间、涡旋类型为决策属性,抽取南海中尺度涡旋的时空关系规则。通过对时空关系规则的分析,分别从时间、空间以及类型上描述了南海中尺度涡旋的具体特征。研究结果表明,南海暖涡多发生于南海东南部以及中部,多发生于冬季,强度涡度都较低,中心区域温度较高,多发生于水深较浅的区域,并且移动距离较小。冷涡则多发生于南海西南部以及南海东北部,多发生于春、秋两季,强度涡度都较高,中心温度偏低,多发生于水深较大区域,移动距离也较大。
Due to the complexity of mechanisms for mesoscale eddy formation in the South China Sea and the numerous causative factors,the methods such as numerical simulation,quantitative statistics,etc,have their limitations in analyzing the relations in time and space among the eddies.The theory of rough sets are applied to describe the relations in time and space of the mesoscale eddies in the South China Sea without any of other priori informations.As a practical example,the data extracted and retrieved from the remote sensing images available in the period from November 2003 to June 2009 are used to show how to obtain the informations about the eddies.The sea area where the eddies are located,the eddy-occurring times,and the eddy types are the main decision properties.Therefore the concrete characteristics about the eddy occurring time,locating area,and type can be described based on the analysis of the regularity of the relations in time and space among the eddies.As it is shown in the studying results,most of warm eddies occur in the southeast and the middle of the South China Sea,and most of them occur in winter.The vorticities are mostly lower in the warm eddies.Most of the warm eddies are situated in the shallower sea area.Most of the warm eddies do not move far away from its original location.To be compared with the warm eddies,most of the cold eddies occur in the sonthwest and the northeast of the Sonth China Sea,and most of them occur in spring or autumn.The vorticities are stronger in the cold eddies.Most of them occur in the deeper sea area of the South china Sea.They move about in a larger range around its original location.
出处
《海洋科学进展》
CAS
CSCD
北大核心
2010年第4期417-427,共11页
Advances in Marine Science
基金
国家高技术研究发展计划项目--空间数据挖掘的地理案例方法及其关键技术研究(2007AA128222)
资源与环境信息系统国家重点实验室自主创新团队计划项目--时空数据挖掘关键技术与典型应用研究(088RA400SA)
关键词
海洋涡旋
时空关系
粗糙集
规则抽取
oceanic eddy
relationship in time and space
rough sets
regularity extraction
